/*
 * Copyright 2006-2008 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.batch.item.database.orm;

import javax.persistence.EntityManager;
import javax.persistence.Query;

import org.springframework.batch.item.ItemReader;

/**
 * <p>Interface defining the functionality to be provided for generating queries 
 * for use with JPA {@link ItemReader}s or other custom built artifacts.</p>
 * 
 * @author Anatoly Polinsky
 * @author Dave Syer
 * @since 2.1
 * 
 */
public interface JpaQueryProvider {

    /**
     * <p>Create the query object.</p>
     * 
     * @return created query
     */
	public Query createQuery();
	
    /**
     * Provide an {@link EntityManager} for the query to be built.
     * 
     * @param entityManager to be used by the {@link JpaQueryProvider}.
     */
    void setEntityManager(EntityManager entityManager);

}
